In mammalian cells, there are six members of the mixed lineage leukemia (MLL) family methyltransferases responsible for methylation of histone H3 lysine 4 (H3K4), including MLL1, MLL2, MLL3, MLL4, SET1A, and SET1B (Rao and Dou, 2015).Although originating from the same ancestor Set1 in yeast, MLL proteins play non-redundant roles in cells because the …
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